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在直角坐标系下 ,将井底压力恢复资料绘成Pt曲线 ,在曲线上任取两个时间点 (t1,t2 ) ,第 3点 (t3 )取其平均值 ,读出对应的P1,P2 和P3 值 ,并求出时间曲线的斜率 ,即可根据图版求出产率指数。选点时 ,t1和t2 间隔不宜过小 ,t1一般选取 4 0min左右 ,t2 选取 30 0min左右。该方法主要依据段塞流测试理论而建立。中国东部某油田采用此法所得预测结果与实际测试结果基本相同
Under the Cartesian coordinate system, the downhole pressure recovery data are plotted as Pt curve, taking two time points (t1 and t2) on the curve and the third point (t3) taking the average value to read the corresponding P1, P2 and P3 value, and calculate the slope of the time curve, you can find the yield index according to the plate. When selecting a point, the interval between t1 and t2 should not be too small, t1 is generally chosen to be about 40 minutes, and t2 is chosen to be about 30 minutes. The method is mainly based on slug flow test theory. The prediction results obtained by this method from an oil field in eastern China are basically the same as the actual test results